Would be NE in a heartbeat (for pvp) if I didn't hate all non-dwarf alliance races and lore. Been Tauren since 2004 and so glad we're finally getting buffed!
That being said I am considering rolling another druid on NE just for having Meld.

Troll getting major nerf with 5% and no snapshotting. It was Op with efflorence, but I am staying tauren even with the weak bonus, the health helps a lot though. thinking about orc for my wlock

You don't really know that yet to be honest. Can't really make that connection without knowing how the mechanics will play out. Think about it with snapshotting gone, when would you use something that gave you 15% haste? Your trinket procs and CDs so you can get more abilities out in the time that the trinket/proc is up.

I'll be going troll -> tauren at some point on my bear. Not sure if I'll do it as soon as I hit 100, or wait until the troll racial would GCD cap me (50-15-5 = 30%?). I imagine this will happen somewhere in the middle of heroic, erm mythic, progression.

Considering going tauren -> troll. I've been playing trolls for most of my WoW "career", but druids were tauren-only when I created mine. I've been considering that for some time without actually doing it, though.

I'll wait until the female tauren and male+female troll models have been released before making any decision.